Stability of type 310S stainless steel bipolar plates tested at various current densities in proton exchange membrane fuel cells
Stability of type 310S stainless steel bipolar plates tested at various current densities in proton exchange membrane fuel cells
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DOI：
10.1016/j.electacta.2016.06.106
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发表时间：
2016-09-01
影响因子：
6.6
通讯作者：
Yashiro, Hitoshi
中科院分区：
文献类型：
--
作者：
Kumagai, Masanobu;Myung, Seung-Taek;Yashiro, Hitoshi
采用单电池在不同电流密度下运行500 h的方法研究了310 S不锈钢双极板。在电池操作期间，电压在较低电流密度下急剧衰减（在0 A cm（-2）下为139 mV），而波动在较高电流密度下减轻（在0.5 A cm（-2）下为21 mV）。运行结果与双极板的表面状况，特别是阴极部分的表面状况密切相关。在较低的电流密度下，出现以氧化铁层为主的增厚层。同时，当施加较高电流时，最外表面富集有薄的氧化铬层。很可能310 S型不锈钢上的厚钝化层增加了气体扩散层和阴极双极板之间的界面接触电阻，从而导致操作期间的渐进电压衰减。有趣的是，在整个电解槽操作过程中不涉及全面腐蚀，这证实了310 S型不锈钢在电解槽操作环境下的优越性。(C)2016爱思唯尔有限公司版权所有。
Type 310S stainless steel bipolar plate is investigated by means of single cell operated at several current densities for 500 h. During the cell operations, the voltage decay is drastic at a lower current density (139 mV at 0 A cm(-2)), while the fluctuation is mitigated at a higher current density (21 mV at 0.5 A cm(-2)). The operation results are highly related to the surface conditions of bipolar plates, in particular, the cathode part. At the lower current density, the thickened layer mainly composed of iron oxide layers appears. Meanwhile, the outermost surface is enriched with thin chromium oxide layers when the higher current is applied. It is likely that the thick passive layer on the type 310S stainless steel increases the interfacial contact resistance between the gas diffusion layer and the bipolar plates of the cathode, thereby resulting in progressive voltage decay during the operation. Interestingly, general corrosion is not involved throughout the cell operation, confirming the superiority of type 310S stainless steel under the cell operation environment. (C) 2016 Elsevier Ltd. All rights reserved.